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New Financial Accounting Pronouncements - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported within Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | $ 35,556 | $ 29,902 |  |
Total cash, cash equivalents and restricted cash | 35,840 | $ 30,659 | $ 28,924 | $ 48,006
ASU 2016-18 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 35,556 |  | 27,166 |
Restricted cash | 284 |  | 1,150 |
Restricted cash included within deferred charges and other assets |  |  | 608 |
Total cash, cash equivalents and restricted cash | $ 35,840 |  | $ 28,924 |

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